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Just two years after influenza viruses were discovered, in 1933, influenza A virus was identified as the agent responsible for human influenza. [ 76 ] [ 81 ] Subtypes of influenza A virus were discovered throughout the 1930s, [ 77 ] and influenza B virus was discovered in 1940.
There are four different types of influenza virus: A, B, C, and D. Influenza C usually causes only mild illness while D mostly affects animals, especially cattle.
Reasonably effective ways to reduce the transmission of influenza include good personal health and hygiene habits such as: not touching your eyes, nose or mouth; [6] frequent hand washing (with soap and water, or with alcohol-based hand rubs); [6] eating a diet rich in fruits and vegetables; [16] covering coughs and sneezes; avoiding close contact with sick people; and staying home yourself if ...
Variants of Influenza A virus are identified and named according to the isolate that they are like and thus are presumed to share lineage (example Fujian flu virus like); according to their typical host (example Human flu virus); according to their subtype (example H3N2); and according to their deadliness (e.g., Low Pathogenic as discussed below).
More than 130 subtypes of influenza A have been discovered in nature, according to the CDC, while influenza B has been divided into just two groups, known as lineages: B Victoria and B Yamagata ...
Influenza activity can sometimes be predicted and even tracked geographically. While the beginning of major flu activity in each season varies by location, in any specific location these minor epidemics usually take about three weeks to reach its pinnacle, and another three weeks to significantly diminish.
Polyvalent influenza vaccine is a type of influenza vaccine that provides immunity against more than one type of antigen. [1] In the second week after receiving the flu shot, the body's immune system is triggered by the antigens so the body starts producing antibodies. These antibodies help fight against influenza viruses.
Influenza B virus is the only species in the genus Betainfluenzavirus in the virus family Orthomyxoviridae.. Influenza B virus is a negative-sense single-strand RNA virus known only to infect certain mammal species, including humans, ferrets, pigs, and seals.